Drag Pack Disappointment
Thread Starter
Instructor
Joined: Oct 2022
Posts: 170
Likes: 53
Drag Pack Disappointment
Went to Showtime last night with half my drag pack installed (still waiting on front tires). I didn't install TPMS sensors in the rear wheels and the car would not go into launch mode. Slowest ET and almost the slowest mph I've seen on my car do date. Does anyone know if I don't run any TPMS's if launch control will work? Will 0 TPMS sensors work the same as 4? I expected a higher trap speed with the rear wheels weighing 13lbs less each even without launch control. I lost 2 mph in trap speed from the last time I ran. I am running a 26 inch rear tire now thinking it would improve acceleration. Was it just a fluke or should I have gone with the stock tire height or bigger?
Thread Starter
Instructor
Joined: Oct 2022
Posts: 170
Likes: 53
Safety Car
Joined: Jul 2019
Posts: 4,079
Likes: 2,414
From: Florida
Supporting Vendor
Joined: Mar 2020
Posts: 727
Likes: 543
From: Atlanta, GA
Went to Showtime last night with half my drag pack installed (still waiting on front tires). I didn't install TPMS sensors in the rear wheels and the car would not go into launch mode. Slowest ET and almost the slowest mph I've seen on my car do date. Does anyone know if I don't run any TPMS's if launch control will work? Will 0 TPMS sensors work the same as 4? I expected a higher trap speed with the rear wheels weighing 13lbs less each even without launch control. I lost 2 mph in trap speed from the last time I ran. I am running a 26 inch rear tire now thinking it would improve acceleration. Was it just a fluke or should I have gone with the stock tire height or bigger?
Hey Brother,
Just a heads up we have seen C8's not go into launch control with all TPMS active when the tire diameter ratio between front and rear is too far off as well just a heads up so the 26 in tall tire may still give you issues unless a shorter front tire is also used.
Thanks
Andrew
Thread Starter
Instructor
Joined: Oct 2022
Posts: 170
Likes: 53
Hey Brother,
Just a heads up we have seen C8's not go into launch control with all TPMS active when the tire diameter ratio between front and rear is too far off as well just a heads up so the 26 in tall tire may still give you issues unless a shorter front tire is also used.
Thanks
Andrew
Just a heads up we have seen C8's not go into launch control with all TPMS active when the tire diameter ratio between front and rear is too far off as well just a heads up so the 26 in tall tire may still give you issues unless a shorter front tire is also used.
Thanks
Andrew
Melting Slicks
Joined: Nov 2012
Posts: 3,163
Likes: 686
From: SUFFIELD CONNECTICUT
Your correct NonZ51Mark, but the OE rear tire is 27.2 and the front like you say is about 25.75, the car is programed for the 1.5 inch tire height or circumference difference between front and rear tires. The 26 tall rear tire maybe your issue, I have read the electronics have about 3% to work with, a 26.5 inch rear tire for instance may have been no issues.
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